Optical disk player with coarse and fine speed control

Details Optical disk player with coarse and fine speed control Optical disk player with coarse and fine speed control

1996-02-26

1998-04-28

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, G11B 700

Patent

active

057454574

ABSTRACT:
An optical disk player utilizes an analog read signal generated from a pickup. The analog read signal is converted to a digital read signal consisting of a plurality of bits in synchronism with a sampling clock in an A/D converter. The digital read signal is then decoded in a decoder and decoded data are generated. An error signal according to the difference between an actual rotational speed of the optical disk and a specified speed is generated on the basis of the digital read signal generated from the A/D converter or the decoded data generated from the decoder. And a rotational speed of a spindle motor is controlled in accordance with the error signal.

REFERENCES:
patent: 4853914 (1989-08-01), Okano et al.
patent: 4855847 (1989-08-01), Kanamaru
patent: 5200944 (1993-04-01), Souma
patent: 5313443 (1994-05-01), Iitsuka

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